Hi Simon,
I have been inspecting what gcc generates and found that in all the
functions I checked which used the thread status in a switch, none of them
generated jump tables, rather, long chains of cmp's.
I predict this is because there are overlapping cases (or even a
fall-through in one I saw,
On 19/07/2014 06:00, Kyle Van Berendonck wrote:
I found these:
https://github.com/ghc/ghc/blob/5f3c5384df59717ca8013c5df8d1f65692867825/includes/rts/Constants.h#L194
They go only 0-14, so there's some long chains of branches and stuff in
hot paths that could be cleaned up into single &-masked br
20, 2014 at 4:43 AM, Jost Berthold <
berth...@mathematik.uni-marburg.de> wrote:
> Message: 2
>> Date: Sat, 19 Jul 2014 15:00:17 +1000
>> From: Kyle Van Berendonck
>> To: "ghc-devs@haskell.org"
>> Subject: Thread status constants
>> Message-ID:
>
Message: 2
Date: Sat, 19 Jul 2014 15:00:17 +1000
From: Kyle Van Berendonck
To: "ghc-devs@haskell.org"
Subject: Thread status constants
Message-ID:
Content-Type: text/plain; charset="utf-8"
Hi,
hc-devs@haskell.org"
>> Subject: Thread status constants
>> Message-ID:
>> > ebyds...@mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Hi,
>>
>> I found these:
>> https://github.com/ghc/ghc/blob/5f3c5384
Message: 2
Date: Sat, 19 Jul 2014 15:00:17 +1000
From: Kyle Van Berendonck
To: "ghc-devs@haskell.org"
Subject: Thread status constants
Message-ID:
Content-Type: text/plain; charset="utf-8"
Hi,
I found these:
https://github.com/ghc/ghc/blob/5f3c5384df59717ca801
Hi,
I found these:
https://github.com/ghc/ghc/blob/5f3c5384df59717ca8013c5df8d1f65692867825/includes/rts/Constants.h#L194
They go only 0-14, so there's some long chains of branches and stuff in hot
paths that could be cleaned up into single &-masked branches by changing
these into a set of flags.
